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Normal coordinate calculations of cis‐ and trans‐CHFCHF and of CF2CH2 have been undertaken using Modified Valence Force Fields based on vibrational data of all the hydrogen and deuterium isotopes. A definite vibrational assignment is given for CF2CH2 based on new infrared and Raman gas phase spectra. The calculated valence force fields of cis‐ and trans‐difluoroethylene. vinylidene fluoride and the vinyl halides mutually agree very well.
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Oskam et al. (1975) studied this question.
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